[Amps] filament transformers

[Paul Decker]

Hello builders, 



My amp continues to grow.   I'm trying to pick out a filament transformer, such and easy task.    



The amp is based on a 3cx800a7 which requires 13.5V +- 0.6V at 1.5A.    I was thinking that a 14V transformer would work great.   Ideally, I would like to build the amp with the option to eventually be expanded to a pair of 3cx800's rather than the single.   This would mean I need 3.0A 



On digikey , they have a 14V 3.0A transformer 

http ://search. digikey .com/scripts/ DkSearch / dksus . dll ?Detail&name=237-1279-ND 



and a 14V 4.0A transformer 

http ://search. digikey .com/scripts/ DkSearch / dksus . dll ?Detail&name=237-1094-ND 





So my questions are:    Is it acceptable to use the higher current rating in the single tube version of the amp?   Would current inrush be an issue?   Is the 3A version enough, should I get the 4A version or something even larger?  Or, is there something else I should be thinking about using? 



thanks, 

Paul, kg7hf